Description
The Zoom/Modem V.92 PCI
outperforms V.90 modems. ITU V.92 is a new standard for dialup modems. It, and its
companion compression standard V.44, makes communications faster, easier and more
enjoyable. The "automatic negotiation" or "handshake" at the beginning
of a call can be over twice as fast with Zoom/Modem V.92 models than with V.90 modems.
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Features
Conforms to new, higher
performance V.92 and V.44 standards Easy Plug and Play installation On-board DSP (Digital
Signal Processor) High quality voicemail Supports V.80 video standard Features
ZoomGuard™ lightning protection Backed by Zoom's extensive manufacturing and support
experience
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Frequently
Asked Questions:
What is V.92?
Allows you to connect
to the Internet faster. Most Internet users dial the same telephone number from the same
location when going online. In this case, the modem can remember the characteristics of
the call and shorten the modem start up sequence. The start-up sequences are the sounds
that the modem makes at the beginning of the connection. Savings will vary from connection
to connection.
What is V.44?
V.44 is a compression standard that describes
a new technique used to pack or compress the data before it travels to and from the modem.
In present V.90 modems, data is compressed using a 10-year-old standard called V.42bis.
V.44 provides better compression capabilities than V.42bis that results in faster transfer
of data.
How can the data transfer rate increase if V.92
analog modems are limited to 56Kbits/sec downstream and 48 Kbits/sec upstream?
These rates describe the rate at which bits can be
transported over the wire and is often referred to as the line rate. By examining the bit
patterns of the data, it is possible to compress or pack the data prior to transmitting
and un-pack the data when it is received. In this way the actual amount of data
transmitted at a given line rate will exceed the rate of the line.
So how does this packing and unpacking work?
You might have come across programs that pack and
unpack data. WinZip is a program that can be used if you want to reduce the size of a
large file prior to emailing it. What you do is pack the large file prior to sending and
the receiving party unpacks it prior to using it. When using this type of program you
might observe that certain files get packed more than others. This is because the packing
looks for redundancy in the data patterns. An extreme example of redundancy is a file that
contains the letter "Y" repeated 1000 times. In this case all you need to do is
send the letter "Y" once and a command that says repeat 1000 times. So instead
of sending 1000 characters, you might only have to send a few characters that contain some
commands. The receiver is smart enough to interpret the command and reconstruct the
original 1000 Y's. In the real world, the amount of packing (or compression) will vary
depending upon the amount of redundancy that exists in a particular file. Some files are
highly compressible and some are not.
So how much
improvement can I expect to see with V.44?
The International Telecommunications Union (ITU), the International Body that develops and
approves these standards, has stated that V.44 gives an improvement in compression of more
than 25% beyond the existing V.42bis standard. Actual improvement will vary depending on
the type of data that is being compressed.
When can I get a modem that complies with the V.92 and V.44 standards?
Zoom Telephonics, a major Modem manufacturer, is shipping modems with V.92 and V.44
capabilities now.
When can I take advantage of the new capabilities offered by V.92 and V.44?
All of the capabilities of V.92 and V.44 will require a headend that supports V.92 and
V.44. The headend is a device that your modem communicates with when you make a connection
and go online. In the case of V.92 and V.44 deployment, the modems are generally available
before the existing headends are upgraded with the new capabilities. Headends in the field
are an essential part of an Internet Service Provider's business and these headends must
be equipped in a slow and careful manner in order to minimize any disruption in internet
service. Because of this, the availability of V.92 and V.44 compatible headends will lag
the availability of V.92 and V.44 compatible modems. Contact your Internet service
provider for a specific timetable of V.92 and V.44 deployment.
What about my existing V.90 or V.34 modem?
Any existing modem will still be fully functional as the head ends are upgraded to V.92
& V.44.
How can I take a phone call while I'm online?
The V.92 standard lets your ISP or online service put your data connection "on
hold" while you pick up a voice call using your "call waiting" service.
When you finish with the voice call you can resume the connection as though you had never
left.
How does this "on hold" feature differ from existing modems that have a call
waiting capability?
Call waiting support is significantly improved under the new V.92 standard. While some
modems support call waiting service from local phone companies now, the Internet
connection will be terminated if you take the call and talk for more than about 7 seconds.
The V.92 standard allows an Internet Service Provider to establish how long they will
allow users to take calls while still maintaining their Internet connection.
Why should I buy V.92/V.44 when DSL and/or cable are available?
Certainly the promise of faster connectivity from DSL or Cable modems has been very
compelling and the speed improvements offered by these type devices are much greater than
the improvements offered from V.92/V.44. According to the International Telecommunications
Union, "the analogue modem will remain the pre-dominant access technology for the
masses for many years to come." Today, analog modems work everywhere and both DSL and
cable modems work in a more limited user space. Also, the price of these modems and the
hidden costs of installation, home wiring considerations and truck rolls can make the
transition to these new technologies less than ideal.
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